Naggar 1966 pl15 f6.JPG
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Naggar 1966 pl15 f6.JPGLinked specimens: London, UK; NHM (PM P 45581) London, UK; NHM (45582)
Current identification:
Original Description
Description. - Test small, coiled in a low trochospire, roughly triglobular, compressed; dorsal side weakly convex; ventral side moderately inflated; equatorial periphery roughly ovoid, distinctly lobate; axial periphery rounded; chambers on the dorsal side appear to be 14 in number; they are arranged in 3 sinistrally coiled whorls, and increase rapidly in size in the early part and slowly later; initial chambers small, indistinct and almost masked by the surface rugosity; the last whorl is composed of 4½ chambers (3½ normal + 1 abortive): withone exception these are relatively large, roughly ovoid, moderately inflated and slightly compressed; the abortive chamber is relatively small, roughly ovoid and indistinct; on the ventral side the chambers are 4½, roughly globular, slightly compressed and increase moderately in size except for the small abortive chamber; sutures on the dorsal side curved, depressed in the early part, almost straight, radial and depressed later; on the ventral side they are straight, radial and strongly incised; umbilicus wid e, deep and open; aperture interiomarginal, umbilical; wall calcareous, per forate; surface distinctly papillose or even nodose, with the nodes tapering out in the form of thick stout, spine-like projections especially along the periphery and around the umbilicus.
Size:
Extra details from original publication
Globigerina nodosa is distinguished from G. triloculinoides Plummer by its nonreticulate, nodose, spinose surface; its much wider umbilicus; its compressed test; and by the lack of the well-developed apertural lip. It is distinguished from G. inaequispira Subbotina by its smaller, compressed, non-elongate test, its heavily spinose surface and its much smaller last chamber. The forms described as Globigerina inaequispira Subbotina, by Loeblich and Tappan (1957) and by Olsson (1960) are completely different from Subbotina's original description and figures, but may belong to the present species, although they are much more inflated. Similarly the spinose forms described as G. triloculinoides Plummer by Shifflett ( 1948, Maryland, Dept. Geol., Mines and Water Resources, Bull., no. 3, pp. 71, 72, pl. 4, figs. 16, 17) belong to the present species. Globigerina chascanona Loeblich and Tappan has a similar surface texture but is much higher on the dorsal side. has more chambers and a much narrower umbilicus. Globigerina stonei Weiss has a more inflated test, an almost rectilinear spiral suture, and its surface texture is not as rough as that of the present species. Globigerina nodosa El-Naggar probably evolved from G. chascanona Loeblich and Tappan although no direct evidence was recorded.""
El-Naggar, Z. R. (1966). Stratigraphy and planktonic foraminifera of the Upper Cretaceous-Lower Tertiary succession in the Esna-Idfu region, Nile Valley, Egypt, U. A. R. Bulletin of the British Museum (Natural History). supplement 2: 1-291. gsReferences:
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Globigerina nodosa compiled by the pforams@mikrotax project team viewed: 4-12-2023
Short stable page link: https://mikrotax.org/pforams/index.php?id=130571 Go to Archive.is to create a permanent copy of this page - citation notes |
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